Stair structure



No. 750,156. PATENTED JAN.19, 1904.

STAIR STRUCTURE.

, APPLICATION FILED MAY 2. 1903. H0 MODEL.

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UNITED STATES NATHANIEL BOIS, OF NEW YORK, N. Y., ASSIGNOR TO CLARABOIS,

Patented January 19, 1904.

PATENT OFFICE.

OF BROOKLYN, N. Y.

STAIR STRUCTURE.

SPECIFICATION forming part of Letters Patent No. 750,156, dated January19, 1904.

Application filed May 2, 1903. Serial No. 155,391. (No model.)

To all whorm it mag concern:

"Be it known that I, NATHANIEL 1301s, a citizen of the United States,and a resident of the cityof New York, borough of Brooklyn, in thecounty of Kings and State of New York, have invented a new and ImprovedStair Structure, of which the following is a full, clear, and exactdescription.

This invention relates to improvements in metallic stairs, an objectbeing to provide a stair structure of novel construction in which aplurality of steps and risers are formed from a single length of sheetmetal.

Other objects of the invention will appear in the general description.

I will describe a stair structure embodying my invention and then pointout the novel features in the appended claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a longitudinal section of a stair structure embodying myinvention. Fig. 2 is an under side view thereof. Fig. 3 is a section onthe line w m of Fig. 1, and Fig. 4 is a longitudinal section showing amodification.

In carrying out my invention a plurality of steps land risers 2 areformed from a single sheet of metal. The step portions are depressed, asat 3, forming pockets or receptacles for concrete 4:, which forms thetread and deadens the sound. At the junction of each step and riser themetal is turned at an angle, as indicated at 4, parallel with theinwardly-turned flanges 5 on the lower edges of the string-pieces 6,which also consist of sheet metal, and fastening devices, here shown asbolts 7, pass through the portions 4 and through the flanges.Nose-pieces 8,0fheavier material, are secured to the steps, and theportions of said nose-pieces overlappingthe steps at the edges arecorrugated, as indicated at 9, to prevent a person slipping on the same.

Underneath each step and having its ends secured to the oppositestring-pieces is a tieplate 10. This tie-plate at its forward edge abutsagainst the inner surface of the riser and not only serves to preventpossible spreading of the string-pieces, but closes the opening 11,formed between the outer edge wall of the depression 3 and the riser,thus prepieces 13. This form of steps is designed particularly to beused in connection with front-door stoops or the like, and therefore ithe lower edges of the string-pieces are here shown as curvedlongitudinally, and it is obvious that the string-pieces may beotherwise ornamented.

It is obvious that a stair structure embodying my invention will be verylight, yet sufiiciently strong for the purpose designed.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. A stair structure comprising stringpieces of sheetmetal having inwardly-extended flanges, a plurality of steps and risersformed of a single length of sheet metal, the steps having depressedportions, the material at the junction of the steps and risers beingformed at an angle parallel with the flanges, fastening devices extendedthrough said portions and the flanges, and concrete or cement in saiddepressions.

2. A stair structure comprising stringpieces of sheet metal havinginwardly-extended flanges, a plurality of steps and risers formed of asingle length of sheet metal secured to the flanges, the steps havingdepressed portions, concrete or cement in said depressed portions, andtie-plates having their ends secured to the string-pieces, the saidtie-plates being extended across the steps between the front walls ofthe depressions and the adjacent risers.

3. A stair structure comprising stringpieces of sheet metal havinginwardly-extended flanges at the lower edge, a plurality of steps andrisers formed of a single strip of sheet metal, the steps havingdepressions, means for connecting the steps and risers to the flanges,tie-plates extendingunderneath the steps and connecting with thestringpieces, concrete in the depressions, and nosepieces havingcorrugated portions extended over the front edges of the steps.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

NATHANIEL BOIS. Witnesses:

JNo. M. BITTER, C. R. FERGUSON.

